Web severing mechanism



Aug. 15, 1950 P. L. ToLLlsQN ETAL WEB SERVERINGMECHANISM 2 Sheets-Sheat 1 Filed March 9, .1946

ATTORNEYS 195.0 1 .1.. TOLLISON ErAL v 2,518,960

' WEB SERVERING MECHANISM Y 2 Sheets-Sheet 2 Filed March 9, 1946 INVENTO .P/YUL L. TOLL CHBHYRLES s.

Patented Aug. 15, 1950 I 2,518,960 WEB SEVERING MECHANISM Paul L. Tollison, North Plainfield, N. J., and

Charles S. Caifrey, Port Washington, N. Y., assignors to Wood Newspaper Machinery Corporation, Plainfield, N. J., a corporation of Virginia Application March 9, 1946, Serial No. 653,402

This invention relates to printing presses and particularly to the folding and severing mechanism associated therewith, especially in newspaper plants. 7

For many years it has been accepted as inevitable that a press room be extremely noisy during operation of. the presses. It is now recognized that a high noise level is productive of unnecessary fatigue and possible impairment of hearing in those who must work under it. It is therefore a principal object of this invention to reduce press room noise level.

We have found that one of the principal sources of noise in a high speed press installation of the type usually found in newspaper plants is the normal operation of the knife box cheek woods. This noise derives from two phases of the cheek wood operation. The first source of noise iS from the cheek wood striking the unsevered web of paper as rotation of the cutting cylinder causes the knife box to approach the folding cylinder. The second source of noise is from the impact of the cheek woodwith its stop during its outward travel along the knife blade after the severance of the paper. The particular object of this invention therefore is to regulate the operation of the cheek wood to eliminate noise from both these sources discussed without impairing the effectiveness of the cheek wood for its original purpose.

A preferred embodiment of our invention is described in the appended drawings in which;

Fig. 1 is a side elevation of a cutting couple of a printing press constructed according to our invention; V

Fig. 2 is a cross section through a portion of the cutting couple illustrated in Fig. 1 taken just prior to the severance of the web;

Fig. 3 is a section similar to Fig. 2 taken at the moment of severance of the web;

Fig. 4 is a section similar to Fig. 2 taken just after the severance of the web; and

Fig. 5 is a partial top plan view of Fig. l with a portion in the section taken on the line 55 of Fig. 3, reduced in scale.

In Fig. l, We have illustrated the cutting couple of a printing press comprising the cutting cylinder l cooperating with the folding cylinder i I to draw a web of paper l2 between the cutting rubbers l3 and the knife l4., This knife I4 is carried in the knife box I and has on either side of it and parallel to its blade, the cheek woods it which are pressed outwards of the knife box by the rod-guided springs I1.

The internal construction of the knife box 5 7 Claims. (Cl. 16466) is more clearly shown in Figs. 2 and 3 in which it can be seen that the outward travel of the cheek woods I6 is limited by cooperation between the shoulder stops IS on the inside of the knife box l5 and the shoulder stops l9 on that surface of each cheek wood opposite the surface in contact with knife I4. The amount of protrusion of the serrated cutting edge of knife I4 is adjusted by the screw '24.

In the operation of cheek woods unprovided with a control device, the cheek woods it are fully pressed outward by springs I1 keeping stops [8 and if! in firm contact at all times during the rotation of cylinder IE except when contact with web I2 forces them inward against the springs ll. Thus the extended cheek woods I6 slap into web l2 causing a considerable noise and, after severance of web l2 has released them and further rotation brings them free of cylinder H, springs I1 thrust cheek woods l6 sharply outward again, slapping the shoulder stops [8 and I9 together and causing evengreater noise.

Referring now to Figs. 1 and 5, it will be seen that the supporting frame 20 of cutting cylinder It carries two camsurfaces, approach cam 2| and departure cam 22 at each end of cylinder Iii, arranged to cooperate with rollers 23 carried by the cheek woods [6. The operation of cams 2i and 22 is clearly illustrated in Figs. 2, 3 and 4.

In contrast to the cycle of operations described for uncontrolled action of check woods, the cooperation of rollers 23 with approach cam 21 retracts the cheek woods l6 sufficiently early to prevent their slapping contact with web I2, but not so early as to render the trailing cheek wood ineffectual as a protection against premature severance of the web. It is of particular importance that, at the moment of severance, web l2 be tightly held by cheek woods as shown in Fig. 3. The profile of cams 2| and 22 is such that, at the moment of severance, rollers 23 are no longer in contact with them and cheek woods I5 are pressed outward by the springs ll firmly gripping web 12 against the cutting rubbers l3. As rotation of the cylinder [0 continues, freeing the cheek woods from contact with cylinder I l and web [2, the rollers 23 come in contact with the departure cam 22. The profile of cam 22 is such that the springs I! can no longer slap together shoulders l8 and [9, but rather an easing together is effected.

We have found that regulation of check wood operation by use of cam surfaces is particularly effective in reducing excessive noise level in press rooms. However, in order to attain fully the advantages of the invention as a silencer without sacrificing the effectiveness of the cheek woods, it is necessary to provide means for adjusting the approach cam surfaces 2|. The principal variable factor in making this adjustment is the thickness of the web l2. As we have already explained, it is essential that at the moment of severance, the pressure exerted between cutting rubbers I4 and cheek woods I 6 on web I2 must not be hindered. At the same time it is desirable that contact between rollers 23 and approach cams 2| be continued as long as possible to avoid noisy operation of the cams and rollers themselves.

Returning to Fig. 1, it will be seen that the approach cam 2| is pivoted about pin 25 on frame 20 and carries an extension arm 26. v On the outer end of arm 26 is pivoted a nut 2'5. The nut 21 is threaded internally and runs on the threaded portion of rod 28, which carries hand wheel 29. The rod and hand wheel .29 are journalled in the pivoted bearing block 30 carried on frame 20. It is apparent that, by turning hand wheel 29, cam 2| can be moved inward and outward in relation to cylinder H], thus delaying or advancing the moment when rollers '23 are no longer in contact with the cam surface. The departure cam 22 is fixed to frame 20 by the bolts 3| and does not require adjustment.

While we have described in detail a specific embodiment of our invention, we do not wish to be limited by the constructional details disclosed but rather by the scope of the appended claims.

We claim:

.1. In the cutting couple of a printing press, a knife box, a knife therein, cheek woods on each side of said knife, .spring means pressing said cheek woods outward from said box parallel to said knife and perpendicular to its cutting edge, cam followers on said cheek woods, and cams cooperating with said followers to regulate the travel of said cheek woods.

2. In the cutting couple of a printing press, a cutting cylinder, a knife box therein, a knife in said box, cheek woods on each side of said knife, spring means pressing said cheek woods outward from said box parallel to said knife and perpendicular to its cutting edge, cam followers on said cheek woods, and cams at each end of said cylinder cooperating with said followers to regulate the travel of said cheek woods.

3. In the cutting couple of a printing press, a frame, a cutting cylinder supported on said frame, a knife box in said cylinder, a knife in said box, cheek Woods on each side of said knife, spring means pressing said cheek woods outward from said box parallel to said knife and perpendicular to its cutting edge, cam followers on said cheek woods, .and a pair of cam surfaces at each end of said cylinder carried by said frame cooperating with said followers to regulate the travel of said cheek woods.

4. The combination of claim 3 in which each pair of cam surfaces comprise an approach cam and a departure cam, said approach cam being shaped and positioned to engage a corresponding cam follower as the knife approaches the cutting position thereby moving the cheek wood away from the cutting edge of the knife and to disengage that cam follower prior to the cutting action of the knife, and said departure cam being shaped and positioned to engage said cam follower after completion of the cutting action thereby retarding the motion of the cheek wood toward the cutting edge of the knife.

5. The combination of claim 1, in which the knife box rotates in a path about the axis of one cylinder of the cutting couple and the cams extend into said path adjacent the point of severance of the cutting couple and are spaced apart at said pointv of severance, whereby the cam followers move out of contact with the cams when the cheek woods are moved inward of the knife box at the point of severance.

6. The combination of claim .2, in which the knife box rotates in 'a path about the axis of the cutting cylinder and the cams extend into said path adjacentthe point of severance of the cutting couple and are spaced apart at said point of severance, whereby the cam followers move out of contact with the cams when the cheek woods are moved inward of the knife box at the point of severance.

7, The combination of claim .3, in which the knife box rotates in a path about the axis of the cutting cylinder and the cam surfaces extend into said path adjacent the point of severance of the cutting couple and are spaced apart at said point of severance, whereby the cam followers move out of contact with the cam surfaces when the cheek woods .are moved inward of the knife box at the point of severance.

PAUL L. TOLLISON. CHARLES S. CAFFREY.

No references cited. 

